Update actions/github-script action to v8 (#4471)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/blocked.yml

@@ -10,7 +10,7 @@ jobs:
       pull-requests: read
     steps:
       - name: Add notice
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         if: contains(github.event.pull_request.labels.*.name, 'X-Blocked')
         with:
           script: |

.github/workflows/post-release.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Trigger pipeline
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           github-token: ${{ secrets.ENTERPRISE_ACTIONS_TOKEN }}
           script: |